VISA For Travel to The USA
Getting Your VISA and Other Documentation
First of all, you must understand that the USA had a Visa Waiver Program (US VWP) which enables nationals of certain countries to travel to the US for tourism or business purpose, for stays of 90 days or less without obtaining a visa.
If somehow, your country were not listed in the US VWP, you’ll need to obtain a visa.
You can access a brief information regarding obtaining a visa to the USA at Identity and Passport Service. Other sites that you might want to expand your reading in this matter are Informing Science and Trail Finders.
For foreign nationals whom are not listed in the US VWP, National Academies is a step by step guide on how to apply for visa in order to travel to the USA.
Besides that, it also show a detailed guide on what to do, what to prepare, where, with whom and how to do it upon departure and arrival in the USA. It is a comprehensive guide with many additional information.